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Passive and Active Control Options for Control of Fuel/Air Ratio in Mini-CPO Reactors for Hydrodesulfurization

IP.com Disclosure Number: IPCOM000206104D
Publication Date: 2011-Apr-13
Document File: 2 page(s) / 55K

Publishing Venue

The IP.com Prior Art Database

Abstract

Use of a mini-CPO reformer to generate hydrogen for an HDS requires careful control of the air/fuel ratio over a wide range of flows in order to prevent overtemperaturing the CPO. Two approaches are discussed which maintains a stable air to fuel ratio at all flow conditions.

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Title:

Passive and Active Control Options for Control of Fuel/Air Ratio in Mini-CPO Reactors for Hydrodesulfurization

Abstract:

Use of a mini-CPO reformer to generate hydrogen for an HDS requires careful control of the air/fuel ratio over a wide range of flows in order to prevent overtemperaturing the CPO.  Two approaches are discussed which maintains a stable air to fuel ratio at all flow conditions.

 

Discussion:

A technique is for controlling air/fuel ratio for a system intended to provide hydrogen for desulfurization in fuel cell applications using a Mini-CPO (catalytic parpartial oxidation) reactor.  Control of Mini-CPO air and fuel ratios within a certain range is required to provide sufficient hydrogen for the desulfurization process and to avoid damage to the Mini CPO catalyst due to excess air.  A passive control design provides a lower cost and more reliable alternative to active approaches.  However, the passive approach must overcome system pressure drop characteristics that tend to push the air/fuel ratio outside acceptable ranges when flow rates are varied over a wide range.  Specifically, the Mini-CPO and Hydrodesulfurizer generally operate in a mixed laminar/turbulent flow regime whereas the orifices, upon which the Mini-CPO and Hydrodesulfurizer depend for providing acceptable air and fuel splits, generally operate in a purely turbulent flow regime.  Therefore, depending upon the pressure drop characteristics of the Mini-CPO and Hydrodesulfurizer, the passive control approach may not achieve acceptable air/fuel ratios.

Two general solutions to the problem...